My 1988 Corvette's electronic A/C control is malfunctining. The A/C control's lights blink on and off and when they do, I can hear the A/C clutch engage. Also the heater (blower) won't come on. Sometimes it works when I press all the buttons. I replaced the A/C control last May with a remanufactured one and it worked OK until a few weeks ago. Before I tear apart my instrument panel a second time, is there anything under the hood, like a sensor or relay that could make the electronic control malfunction? (My local Chevy dealer says I have a one year warranty on the unit so at least I don't have to spend another $350.)